<template>
	<view>
		<view class="search-box">
			<uni-search-bar 
			:radius="100"  
			@input="input" 
			cancelButton="none"></uni-search-bar>
		</view>
		<view class="history-box" v-if="searchResults.length===0">
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="cleanHistory"></uni-icons>
			</view>
			<view class="history-list">
				<uni-tag 
				type="primary" 
				:text="item" 
				v-for="(item,i) in historis" 
				:key="i"
				@click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
		
		
		<view class="sugg-list" v-else>
			<navigator 
			class="sugg-item" 
			v-for="(item, i) in searchResults" 
			:key="i"
			:url="'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="right" size="16"></uni-icons>
			</navigator> 
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				// 延时器的 timerId
				timer: null,
				// 搜索关键词
				kw: '',
				// 搜索列表
				searchResults: [],
				//搜索关键词的历史记录
				historyList:[],
				
			};
		},
		onLoad() {
		  this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},

		methods:{
			input(e){
				clearTimeout(this.timer)
				// e 是最新的搜索内容
				this.timer=setTimeout(()=>{
					this.kw = e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				if (this.kw === '') {
				    this.searchResults = []
				    return
				  }
				const {data:res}=await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				if(res.meta.status!=200) return uni.$showMsg()
				this.searchResults=res.message
				
				this.saveSearchHistory()
			},
			saveSearchHistory(){
				// this.historyList=[...this.historyList,this.kw]
				const set = new Set(this.historyList)
				 // 2. 调用 Set 对象的 delete 方法，移除对应的元素
				set.delete(this.kw)
				  // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
				set.add(this.kw)
				// 4. 将 Set 对象转化为 Array 数组
				this.historyList = Array.from(set)
				// 调用 uni.setStorageSync(key, value) 将搜索历史记录持久化存储到本地
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},	
			cleanHistory(){
				this.historyList=[]
				// 清空本地存储中记录的搜索历史
				  uni.setStorageSync('kw', '[]')
			},
			gotoGoodsList(item){
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' + item
				})
			}
		},
		computed:{
			historis(){
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
.search-box {
  position: sticky;
  top: 0;
  z-index: 999;
}

.history-box{
	padding: 0 5px;
	.history-title{
		border-bottom: 1px solid #efefef;
		height: 40px;
		line-height: 40px;
		font-size: 13px;
		display: flex;
		justify-content: space-between;
	}
	
	.history-list{
		display: flex;
		flex-wrap: wrap;
		
		.uni-tag{
			margin-top: 5px;
			margin-right: 5px;
			
			
		}
	}
	
}

.sugg-list{
	padding: 0 5px;
	
	.sugg-item{
		font-size: 12px;
		padding: 13px 0;
		border-bottom: 1px solid #efefef;
		display: flex;
		align-items: center;
		justify-content: space-between;
		
		.goods-name{
			// 文字不允许换行（单行文本）
			      white-space: nowrap;
			      // 溢出部分隐藏
			      overflow: hidden;
			      // 文本溢出后，使用 ... 代替
			      text-overflow: ellipsis;
			      margin-right: 3px;
		}
		
		
	}
}

</style>
